Telegraphy.



P. B. DELANY.

TELEGRAPHY.

APPLICATION FILED AUG.23. 1917- Patented Aug. 6, 1918.

PATRICK B. DELANY, OF SOUTH ORANGE, NEW JERSEY.

TELEGRAPHY.

Specification of Letters Patent.

Patented Aug. 19118.

Application filed August 23, 1917. Serial No. 187,780.

T 0 all whom it may concern,

Be it known that I, latrinok B. DuLANr, a citizen of the United. States, residing at South Orange, in the county of llssex and State of New Jersey, have invented a new and useful In'iprovement in 'llelegraphy, of which the following is a'specilication.

My improvement has specific reference to the transmission of Morse signals over telephone circuits by conveyance of mechanical and air vibrations to a microphone by means of impacts caused by vibrations of an automatic vibrator or buzzer, or caused by single impacts or blows of the vibrator armature When deprived of its automatic vibrations at the will of the operator through the medium of a switch arm mounted in a detached base holder of the telephone transmitter along with the telegraph key and the buzzer. In this way regular Morse signals or buzz signals, corresponding in a way, to wireless signals, may be transmitted. The switch controlling the buzzer is located in about the same relative position to the key as the circuit closing arm of the ordinary Morse key.

In U. S. Patent No. 1,137,193 granted to me April 27, 1915, I have shown and described a method for transmission of Morse signals over a telephone circuit by actuation of a buzzer in the stem or base of a telephone transmitter, and in an application now pending, Serial No. 172,684, filed June 4, 1917, I have shown and described a method of actuating a microphone transmitter by or shocks imparted to it directly by a Morse key lever located in a detached base holder upon which the standard desk telephone transmitter rests. While these methods are highly practical and. satisfactory my present invention has certain advantages of convenience and choice of systems which those cited do not possess. The option of regular Morse solid signals or the buzzing impulse signals renders this invention highly advantageous since it enables operators to use the system with which they are most familiar and the one which may be best adapted to conditions of a circuit at the time. It will be seen that all the operating parts, key, buzzer and switch, are inclosed Within the telephone base holder without any clamping or electrical connection whatever between the telephone and the base so that for speech the telephone may be handled in the usual way while for telegraphy it is simply placed on the base holder containing the telegraph transmitting parts. In the pending application referred to transmission is ell'erted by the key lever striking against a screw in the bottom of the telephone base. In the present impmvement the shocks or vibrations representing signals are mechanically conducted to the telephone base by an arm extending from the buzzer frame to the base of the telephone and under constant pressure against it. The key has no part in the operation except to open and close the buzzer circuit.

An important feature of this improvement is the advantage gained by conversion of the buzzer to a single stroke sounder with the usual rigid limit stop for the forward movement of the arnntture but with a yielding spring limit for the backward movement, thus unn'iistakably differentiating the reading stroke from the back stroke. l or convenience, a non-metallic pin inserted in the core of the magnet to prevent sticking of the arn'lature may be used as it gives the true anvil blow effect in the distant telephone receiver.

In the accompanying drawings, Figure 1 represents diagrammatieally a complete cmbodiment of my invention; lti 2 represents a top view of the base with the telephone in position; Fig. 3 is a top view of the base with the telephone removed.

:leferring now more particularly to Fig. 1 of the drawings in which I have shown diagramnuttically the relationship of the several parts comprised in a complete organization, with circuit connections, K is the key which operates the buzzer V. A spring arm 0 extends from the casing or frame of the buzzer to screw 7) in the base of the telephone transmitter T. S is a switch for shunting the interrupter, comprising the vibrating itlll'ltltlll't) a and contact 0 of the buzzer so that characters may be of the buzzing kind or single unit impulses of the regular Morse formation. Both styles of impulses may be conformable to the standard Morse code. I is the telephone induction coil and 7) the battery in the primary cireuit, while battery 7) operates the buzzer.

In the position of switch S shown in the drawing the key K will operate V as a buzzer] lVhen the switch is moved to contact with shunting contact 2' V will be operated on the single impulse plan, like an ordinary ele tro-magnetic relay or sounder,

Fig. 2 represents a top view of the telephone base in position on its detachable base in which are disposed the key K, the buzzer and switch S with the operating parts of the key andswitch levers extending beyond the detachable base.

Fig. 3 is a plan view of the key, buzzer and switch in the detachable base with the telephone removed. This figure clearly shows the manner in which the base is provided with slots through which the key and switch project.

The operation is as follows:

When the key K is pressed down the circuit of V is closed for buzzer actuation by interruption of its circuit contacts a, c. The mechanical vibrations set up in the frame or cover 0 of the buzzer are conducted through arm 6, to screw p in the base of telephone T, and thence communicated to the microphone, where they are transmitted as electric impulses to the primary and sec 'ondary coils of induction coil I. hen it 1s desired to send ordinary Morse single impulse signals switch S is moved to its shunting contact 71, causing the armature of V to respond unbrokenly to the movement of key K. The shocks of the armature blows are mechanically conveyed to the microphone as already described.

To overcome the difficulty of back stroke translation of signals at the receiving end when rigid limit stops are used for the transmitter arm, either key or magnet lever, the back limit is formed of a yielding lever, which for convenience, may be the spring contact 0 for automatic actuation of the buzzer.- Thus the impacts of the buzzer lever at its rigid front limit stop will be easily differentiated from the softer scraping engagement with its sp'ringy back limit stop when the circuit is broken. The nonmagnetic pin cl in the core of the magnet of V answers well as a front limit stop and when used as a vibrator or in either style of operation prevents the armature from sticking to the magnet.

It should be understood that metallic contact between the transmitter and the base of the telephone is not altogether necessary conducted to the diaphragm through the air,

would be suflicient to effect the microphone for telegraphic transmission, but not to the degree of loudness and sharpness desirable for practical operation. Nevertheless the eflects incidental to the arrangement and operation 'of the apparatus shown and described herein are to be considered as within the scope and intent of this invention.

I claim as my invention:

1. In telegraphy, a microphone, a detacl1- said base, a telegraph key in said base, and

a switch also in said base for transformsaid holder comprising a buzzer, a telegraph key, a switch controlling said buzzer and openings in said holder through which the lovers of said key and said switch extend for manipulation.

4. In telegraphy, a telephone microphone, a base for support of said microphone, an electromagnetic signal maker in said base, its armature, a rigid limit stop for said armature in its forward movement, and a yielding spring stop for said armature in its backward movement.

5. In telegraphy, a microphone, a holder for said microphone, an electromagnetic signal maker vibratorially actuating said microphone, and means for transforming said. signal maker from buzzing to single impulse operation, and vice versa.

6. As an article of manufacture, a base adapted to hold a telephone, said base having a buzzer, means for conducting vibrations from said buzzer to the telephone, a Morse key in circuit with said buzzer, and a switch for converting the buzzing impulses of said buzzer to single impulse opersource of electric energy connected to said electromagnet, an interrupter in circuit with said electromagnet and-source of current, a telegraph key in the circuit with said electromagnet and source of current. and a switch in said circuit for short circuiting said interrupter.

8. A telegraph attachment for telephones, comprising a holder adapted to support a telephone stand and base of usual construction, a buzzer in said holder, means projecting from said buzzer to directly engage the telephone base when the parts are in operative position for transmitting vibrations from the buzzer to the base, and means for actuating said buzzer for the transmis sion of telegraphic signals.

9. A telegraph attachment for telephones, comprising a holder adapted to support a telephone stand and base of usual construction, a buzzer in said holder, means project ing from said buzzer to directly engage the telephone base when the parts are in operative position for transmitting vibrations from the buzzer to the base, and means within the holder and out of contract with said base for actuating the buzzer for the transmission of telegraphic signals.

10. A telegraph attachment for telephones, comprising a holder adapted to receive and support the base of a telephone stand of usual construction, and means secured Within said holder for transmitting either, sustained or individual signal vi- 4 brations to said telephone stand.

11. A telegraph attachment for telephones, comprising a holder adapted to receive and support the base of a telephone stand of usual construction, and a buzzer secured Within said holder for transmitting PATRICK B. DELANY.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. C. 

